A small building either 1 tile, 2x1 tiles, or 2x2 tiles called a Fishery, or a small pond, same possible dimensions that can be used to raise, breed, and harvest fish in the same respects as a coop, but for fish. Could even do both objects/buildings, each giving its own bonus, fishery building increases breeding/quantity, the pond would increase quality.
Would help to level animal lore more reasonably as well as help players who dont live near water, for instance I live in the mountains and no where near water, so fishing hasnt been realistic on a regular basis, and because of the altitude I cant even dig down enough to create my own pond for fishing. Thanks!